The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1976
Filed:
Jan. 23, 1975
Philip P Carvey, Bedford, MA (US);
Applicon Incorporated, Burlington, MA (US);
Abstract
An electrographic input system comprises a set of a first plurality of electrical conductors and a second plurality of electrical conductors arranged so as to form a coordinate system. The conductors of the first plurality are sequentially energized at a fast scan rate so as to provide a high intensity electric field in proximity to each energized conductor. A moveable probe is provided for sensing the electric field provided by each of the first plurality so as to provide a first signal responsively thereto. A selected number of the first plurality of conductors is energized at a slow scan rate so as to provide a plurality of second signals, each representative of the electrical field intensity strength between the probe and each of the selected number of conductors energized during the slow scan. Means are provided for determining the centroid of the second signals and for generating a third signal in response thereto. This third signal is indicative of the probe position with respect to the first plurality of conductors. The signals are then determined for the second plurality of grid conductors.